Gosta osvald



Patented Dec. 1929 4 U I STATES. PATENT orrlcs Q6811. OSVALD, OI STOOKHOLM, SWEDEN, ABSIGNOB TO WIN'I'KBOI' CHEMICAL COMPANY, INC., F NEW YORK, N. Y. n'

DUST DISINFECTANT Ho Drawing. Appllcatlonnled June 29, 1926, Serial Ho. 118,432, and in Sweden J'uly 29, 1925.

This invention relates to an improved dust cannot be combated effectively with small disinfectant adapted for use in disinfecting quantities of mercury. The polymeric forseed by the dry process, i. e. without the use of maldehyde is, preferably, used in a quantity disinfecting aqueous solutions. corresponding to 5 to grams of polymeric a The dust disinfectants hitherto used are not formaldehyde per 100 kgs. of seed. The merfully eifective in all cases. For instance the cury compound may consist of any of the dust disinfectants containing mercury comorganic or inorganic mercury compounds pouhds as active substance, are fully effective which-already have been proposed as active against snow mold (Fusarium) on the most constituents of dust disinfectants for seed.

- n kinds of cereals and have also a good effect Adust disinfectant'accordingto this invena against the stinking smut (Tilletia) on wheat, tion has besides the advantage of being effecwhereas their action against loose and covered tive against all usually occurring fungous dissinuts of oats and some other diseases of the cases, also the advantage that it is much less cereals caused by various parasitic fungi is poisonous than other dust disinfectants conia iess satisfactory. The mercury preparations tainin only mercury as active constituents. e hitherto used have a composition correspond- As ilutmg inactive substance I prefer to ing to a consumpti n of about 5 grams of use finely divided talc but also magnesia, iron mercury on 100 kg of seed when they 'are oxide or other finely divided substances whichused in the prescribed manner. A full effect are easily mixed with the active-substances as against all usual diseases of the cereals caused and have a good adhesion to the seed grains byfungi can not be attained without an essenmay be used. tial increase of the percentage of mercury Example 1.3O gr. of paraformaldehyde over the figure above stated but then the disand 5 gr.. of mercurous chloride (Calomel) or infection will be too expensive. On the other 30 gr. of paraformaldehyde and 5 gr. of finely as hand, the dust disinfectants containing polydivided mercuric chloride (corrosive subliineric formaldehyde as active substance show mate) are intimately mixed with 965 gr. of f a good eifect on the most diseases of the cereals pulverulent talc.

caused by fungi with the exception 'of Fusa- E mample 2. 30 gr. of araformaldehyde rium, its action against the latter being less and 7 gr. ofmercury sahcy ate are intimately as satisfactory. mixed with 963'gr. of pulverulent talc. b

The object of this invention is to produce a Em plg -30 grf paraformaldehyde dust disinfectant which can bemanufactured and 10 gr of mercury nltrophenol are mtiat a low cost and which is'eflt'ective against all mately mlxed with 965 gr. of pulverulent usually occurring smuts on the cereals, inclu talc. as sive of Fusarium. The dust disinfectant ac- F 1 th i lnf g Of 1 0 g Qf seed a s5 cording to this invention contains as active quantity of 200 to 300 gr. of any of the above constituents polymeric formaldehyde as well mentioned mixtures is suflicient. as a mercury compound. i A loss of formaldehyde by the escape of Experiments have proved that Fus'arium gaseous formaldehyde from the preparation in can be effectively combated by means of a enerally occurs when the product is stored. o dust disinfectant containing an essentially his loss can according to the invention be iower percentage of mercury than the merprevented by an addition of one or more subcury preparations hitherto used. It has been stances which easily combine with formaldefound that it is generally sufiicient to use from hyde. Y Such substances are. for instance at. to of the quantity of mercury hitherto starch and starchy substances, dextrin, ala used, i. e. about V to 1 gram of mercuryto bumins. and albuminous substances, tannins, lrgs. of seed if the mercury compound-is used tannic acid, and -so on. The compounds of together with a suitable quantityof polymeric formaldehyde with said added substances formaldehyde. The lattr constituent is then which during storin are formed from the ca efiective against such fungous diseases which gaseous formaldehyde escaping from the 100 polymeric formaldehyde have practically the same value for the disinfection of the seed as substance. 3. Dust disinfectant for seed. and the like, ofa mixture of pol meric forthe polymeric formaldehyde inasmuch as also said compounds like the polymeric formaldehyde give off formaldehyde which kills the germs when the disinfected seed has been put nto the ground. As an example of the manufacture of such a disinfectant the following may be mentioned: 30 gr. ofparaformaldehyde, 50 gr. of wheat-flour and 10 gr. of mercury nitrophenol are intimately mixed with 910 gr. of pulverulent talc.

In manufacturing'the disinfectant I can for the polymeric formaldehyde wholly substitute compounds of ormaldehyde which are successively decomposed while giving off formaldehyde when subj ected to the action of the moisture and the carbonic acid of the soil. Such compounds are for instance compounds of the above-mentioned substances with formaldehyde, viz compounds of formaldehyde and starch or starchy substances, dextrin, albumins and albuminous substances, tannins, tannic acid, and so on.- As an example of the manufacture of a disinfectant of such composition the following ma be mentioned; 100 gr. of a compound 0 de'xtrin and formaldehyde containing about 30% by weight of formal ehyde) and 10 gr. of mercury nitrophenol are intimately mixed with 890 gr. of pulverulent talc.

'For the disinfection of 100 k quantity of200 to 300 gr. of any ofthe above mentioned mixtures is ndeded.

What I claim is:

1. Dust disinfectant for seed and the like,

consistin ,of a mixture of pol meric formaldehy e, a mercury compoun and a 'pulverulent dilutin substance.

2. Dust disin ectant for seed and the like, consisting of a mixture of 2 to 4% by weightof polymeric formaldehyde, amercury compound in such quantity that the conte'nt of. metallic mercur 0f the mixture is about 0.2 to 0.4% by weig t, and a pulverulent diluting consistin maldehy e, a substance havin t e property of absorbing gaseous formal ehyde and-of combining therewith @a mercury compound, and a pulverulent diluting substance.

'4. Dust disinfectant for seed and the like,

consistin of bodies having the ropertyof giving 0 formaldehydewhen gm ected to the moisture and carbonic acid of t e'soil, a mercury compound,and a pulverulent diluting substan In testimony whereof I have signed my name.

GQSTA, OSVALD.

artly or gs. of seed a' 

